Manufacturing method for solid-state battery and manufacturing apparatus for solid-state battery

Abstract

Provided is a manufacturing method for a solid-state battery capable of achieving densification, improvement of productivity, and preferred battery characteristics in a compatible manner. Embodiments provide a manufacturing method for a solid-state battery including an electrode layer composed of a positive electrode layer and a negative electrode layer, and a solid electrolyte layer, the method including: a first pressing step of pressing a layer including at least the solid electrolyte layer; a irregularity forming step of forming irregularities on a surface of the solid electrolyte layer; and a second pressing step of pressing the solid electrolyte layer and the electrode layer to thereby produce a laminate.

What is claimed is: 
     
         1 . A manufacturing method for a solid-state battery including an electrode layer composed of a positive electrode layer and a negative electrode layer, and a solid electrolyte layer, the method comprising:
 a first pressing step of pressing a layer including at least the solid electrolyte layer;   an irregularity forming step of forming irregularities on a surface of the solid electrolyte layer; and   a second pressing step of pressing the solid electrolyte layer and the electrode layer to thereby produce a laminate.   
     
     
         2 . A manufacturing method for a solid-state battery including an electrode layer composed of a positive electrode layer and a negative electrode layer, and a solid electrolyte layer, the method comprising:
 a densification/irregularity-forming pressing step of pressing a layer including at least the solid electrolyte layer and forming irregularities on a surface of the solid electrolyte layer; and   a second pressing step of pressing the solid electrolyte layer and the electrode layer to thereby produce a laminate.   
     
     
         3 . The manufacturing method for a solid-state battery according to  claim 1 , wherein
 the forming of the irregularities on the surface of the solid electrolyte layer is performed by a press machine having projections on a contact portion that comes into contact with the solid electrolyte layer and configured to form the irregularities on the surface of the solid electrolyte layer using the projections of the contact portion.   
     
     
         4 . The manufacturing method for a solid-state battery according to  claim 3 , wherein
 the contact portion of the press machine is a sheet-like body having a surface with projections formed thereon, and   the sheet-like body is used by being wound around a cylindrical body.   
     
     
         5 . The manufacturing method for a solid-state battery according to  claim 4 , wherein
 the sheet-like body is detachably provided on the cylindrical body.   
     
     
         6 . The manufacturing method for a solid-state battery according to  claim 4 , wherein
 the sheet-like body is sandpaper.   
     
     
         7 . The manufacturing method for a solid-state battery according to  claim 4 , wherein
 the cylindrical body is a zirconia tube.   
     
     
         8 . The manufacturing method for a solid-state battery according to  claim 3 , wherein
 the forming of the irregularities on the surface of the solid electrolyte layer includes continuously forming the irregularities by a roll having a surface with irregularities.   
     
     
         9 . The manufacturing method for a solid-state battery according to  claim 3 , wherein
 the forming of the irregularities on the surface of the solid electrolyte layer includes continuously forming the irregularities in multiple stages by a plurality of rolls having surfaces with irregularities.   
     
     
         10 . The manufacturing method for a solid-state battery according to  claim 1 , wherein
 the solid electrolyte layer includes a first region having a predetermined thickness inward from the surface of the solid electrolyte layer and a second region located further inside the solid electrolyte layer than the first region, and   the forming of the irregularities on the surface of the solid electrolyte layer includes forming the irregularities only in the first region.   
     
     
         11 . A manufacturing apparatus for a solid-state battery including an electrode layer composed of a positive electrode layer and a negative electrode layer, and a solid electrolyte layer, the apparatus comprising:
 a first presser configured to press a layer including at least the solid electrolyte layer;   an irregularity former configured to form irregularities on a surface of the solid electrolyte layer; and   a second presser configured to press the solid electrolyte layer and the electrode layer to thereby produce a laminate.   
     
     
         12 . A manufacturing apparatus for a solid-state battery including an electrode layer composed of a positive electrode layer and a negative electrode layer, and a solid electrolyte layer, the apparatus comprising:
 a densification/irregularity-forming presser configured to press a layer including at least the solid electrolyte layer and form irregularities on a surface of the solid electrolyte layer; and   a second presser configured to press the solid electrolyte layer and the electrode layer to thereby produce a laminate.   
     
     
         13 . The manufacturing apparatus for a solid-state battery according to  claim 11 , wherein
 the irregularity former configured to form the irregularities on the surface of the solid electrolyte layer is a former configured to continuously form the irregularities using a cylindrical body having sandpaper wound therearound.   
     
     
         14 . The manufacturing apparatus for a solid-state battery according to  claim 11 , wherein
 the irregularity former configured to form the irregularities on the surface of the solid electrolyte layer is a former configured to continuously form the irregularities using a metal roll having a surface subjected to sandblasting.   
     
     
         15 . The manufacturing apparatus for a solid-state battery according to  claim 11 , wherein
 the irregularity former configured to form the irregularities on the surface of the solid electrolyte layer is a former configured to continuously form the irregularities using rolls disposed in multiple stages, the rolls having surfaces with irregularities.   
     
     
         16 . The manufacturing apparatus for a solid-state battery according to  claim 11 , wherein
 the irregularity former configured to form the irregularities on the surface of the solid electrolyte layer forms projections on the surface of the solid electrolyte layer, and   the second presser is configured to press the solid electrolyte layer and the electrode layer while crushing the projections to thereby produce a laminate.